摘要：Aiming at the problem that the existing noise suppression methods are not suitable for marine electromagnetic environment monitoring,a noise suppression method based on adaptive least mean square (LMS) algorithm is proposed to suppress the noises of ocean wave induced magnetic field in marine electromagnetic environment monitoring.First, a general model of ocean wave induced magnetic field and a model under the condition of infinite water depth are constructed to analyze the ocean wave induced magnetic field.Then,the transmitting and receiving signals in the process of marine controlledsource electromagnetic exploration are further analyzed to identify the noise in the whole process.Finally,the LMS adaptive filtering algorithm is used to estimate and suppress the noise of ocean wave induced magnetic field.In order to verify the effectiveness of the proposed method,an experimental platform is built to test and analyze the method.The results show that the proposed method can filter out most of the noise in ocean wave induced magnetic field and geomagnetic field,and greatly improve the time domain waveform.Compared with other methods,the proposed method has the advantages of simple calculation,strong real-time performance and good noise suppression effect,which can improve the monitoring ability of marine electromagnetic environment.
关键词：Marine noise pollution;Geomagnetic exploration;Marine electromagnetic environment monitoring;Adaptive LMS algorithm;Noise suppression;Ocean wave induced magnetic field
